Abstract
The article presents results of research on an adjustable check valve. In particular, the article deals with improvement of flow characteristics and reduction in pressure losses of an existing valve design. The subject of the research was the valve body in the form of a steel block intended for mounting a typical cartridge valve insert. Two variants of the valve body were analysed: a standard one, which is currently in production, and the proposed new solution, in which the geometry was modified based on the results of CFD simulations. The main research task was to properly shape and arrange holes and flow channels inside the body, between the cartridge valve and the connecting plate. Using CFD analyses, a solution for minimising the flow resistance was sought and then the method of modifying flow channels geometry was developed. The CFD simulation results showed a significant reduction in pressure loss, up to 40%. The obtained simulation results were verified on a test bench using a prototype of the proposed valve block. A high degree of consistency in the results of CFD simulations and laboratory experiments was achieved. The relative difference between simulation and experimental results in the entire considered range of the flow rate did not exceed 6.0%.
Highlights
Check valves are key components of hydraulic control systems
It is possible to improve flow characteristics of the valve by modifying geometry of the flow channels inside the steel housing, based on the results of simulation tests carried out using the CFD method
The results of CFD simulations obtained for the I and I I valve versions in the entire flow rate range are presented in Table 3, while the resulting flow characteristics are shown in Figures 13 and 14, respectively
Summary
Check valves are key components of hydraulic control systems. Design solutions in the form of cartridge-type inserts are becoming increasingly more popular as they allow the designer to create the housing according to individual needs and their own idea. Steel housings are most often made in piece and small-lot production and for operating at higher pressures due to better strength parameters In this case, the flow channels are made by machining, usually using the drilling or milling operations. It is possible to improve flow characteristics of the valve by modifying geometry of the flow channels inside the steel housing, based on the results of simulation tests carried out using the CFD method. There are publications on the CFD analyses involving extreme operating conditions, such as turbulent compressible flow through a multi-stage high pressure reducing valve conducted by Chen et al [12], or thermal fluid-structure analysis of fast pressure relief valve under severe nuclear accident by. The principle of the valve operation ensures that the flow in one direction takes place through the pressure acting directly on the valve poppet against the spring force, while in the opposite direction the flow is opened by a hydraulic control signal applied to the pilot piston
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